'\" te
.\" Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved
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.TH DDI_GET_EVENTCOOKIE 9F "Nov 6, 2003"
.SH NAME
ddi_get_eventcookie \- retrieve a NDI event service cookie handle
.SH SYNOPSIS
.nf
#include <sys/dditypes.h>
#include <sys/sunddi.h>

\fBint\fR \fBddi_get_eventcookie\fR(\fBdev_info_t *\fR\fIdip\fR, \fBchar *\fR\fIname\fR,
     \fBddi_eventcookie_t *\fR\fIevent_cookiep\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH PARAMETERS
.ne 2
.na
\fB\fBdev_info_t *\fR\fIdip\fR\fR
.ad
.sp .6
.RS 4n
Child device node requesting the cookie.
.RE

.sp
.ne 2
.na
\fB\fBchar *\fR\fIname\fR\fR
.ad
.sp .6
.RS 4n
NULL-terminated string containing the name of the event.
.RE

.sp
.ne 2
.na
\fB\fBddi_eventcookie_t *\fR\fIevent_cookiep\fR\fR
.ad
.sp .6
.RS 4n
Pointer to cookie where event cookie will be returned.
.RE

.SH DESCRIPTION
The \fBddi_get_eventcookie()\fR function queries the device tree for a cookie
matching the given event name and returns a reference to that cookie. The
search is performed by a calling up the device tree hierarchy until the request
is satisfied by a bus nexus driver, or the top of the \fBdev_info\fR tree is
reached.
.sp
.LP
The cookie returned by this function can be used to register a callback
handler, unregister a callback handler, or post an event.
.SH RETURN VALUES
.ne 2
.na
\fB\fBDDI_SUCCESS\fR\fR
.ad
.RS 15n
Cookie handle is returned.
.RE

.sp
.ne 2
.na
\fB\fBDDI_FAILURE\fR\fR
.ad
.RS 15n
Request was not serviceable by any nexus driver in the driver's ancestral
device tree hierarchy.
.RE

.SH CONTEXT
The \fBddi_get_eventcookie()\fR function can be called from user and kernel
contexts only.
.SH ATTRIBUTES
See \fBattributes\fR(7) for a description of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
.TE

.SH SEE ALSO
.BR attributes (7),
.BR ddi_add_event_handler (9F),
.BR ddi_remove_event_handler (9F)
.sp
.LP
\fIWriting Device Drivers\fR
